let's develop more stars in education. let's invest in our teachers... ...so they can inspire our students. let's solve this. >>> our third story "outfront," iran refuses to budge despite some talk about possibly suspended some parts of its nuclear program. officials tell cnn tonight, the iranian don't appear to be conceding any real ground. sent the iranian currency plunging, as much 40%. that in one week. that has sparked angry protests. in the streets of tehran. the u.s. is stepping up pressure with a show of military force in the persian gulf. this is a tense and exciting situation in many ways because of all of the possibilities out there. chris lawrence is "outfront." >> imminent surface threat. >> reporter: if fighting breaks out with iran in the persian gulf, it will look a lot like this drill. u.s. navy sailors making split-second decisions on whether to shoot at a speedboat. >> i ask, would you shoot? knowing you're responsible for the lives of everybody on board? that's a tough one. if you get it right, congratu